usb: dwc3-msm: Add in_p3 check for dual port controller

We should bail out of suspend routine for multiport controller
even if no device is connected and SSPHYs are not in P3.
Add the check for the same.

Change-Id: I766cd2f587192967d28b66b22c79f328bd9982f8
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>